PD on a ring typically signifies palladium. Your ring can be palladium-plated if it's PD written around it. TK316 is brief for TUSK Stainless-steel, which indicated that your jewellery will continue to be stainless and you will have no hassle cleansing it. Halo is a stone environment to the ring, https://stephencwofy.blogzet.com/facts-about-jp88-revealed-51702977